Cation self-diffusion and impurity diffusion in Fe2O3+ |
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Authors: | K Hoshino NL Peterson |
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Institution: | Materials Science and Technology Division, Argonne National Laboratory, Argonne, IL 60439 U.S.A. |
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Abstract: | Cation self-diffusion D1Fe, parallel to the c axis has been measured as a function of temperature (1100–1300°C) and oxygen partial pressure po2 (2 × 10?3-1 atm) in the same single crystals of Fe2O3 as those used by Chang and Wagner. Whereas the po2 dependence of D1Fe, observed by Chang and Wagner has been confirmed, the absolute value of D1Fe and the activation enthalpy for self-diffusion are much higher than those reported by them. The various diffusion studies indicate that cation self-diffusion occurs by an interstitial-type mechanism. However, the sample-to-sample variations in D1Fe, suggest that all diffusion measurements may have been performed on samples where the defect concentrations are impurity controlled. Impurity diffusion of 60Co, 51Cr, and 88Y has also been measured as a function of po2 at 1200°C. The results indicate that these impurities diffuse by an interstitialcy mechanism in Fe2O3. |
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Keywords: | self-diffusion tracer impurity diffusion diffusion mechanisms point defects |
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